US to field deadlier missile in war againt al Qaeda * US Army hopes to deploy new Hellfire version soon * "One missile for many missions," manufacturer says * Combines killing capabilities of all previous models By Jim Wolf WASHINGTON, Oct 14 (Reuters) - A precision-strike missile that has been a star of the U.S.-led war on al Qaeda and its allies is about to get deadlier. The cylindrical, 108-pound (49-kg) missile, known as Hellfire II, has been the weapon of choice on remotely piloted aircraft such as the General Atomics MQ-1A Predator and the MQ-9 Reaper. These drones have...